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[report整理] SENEWS-2011-03-21

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[Homework]SENEWS-2011-03-21

This is the VOA SE technology report.
A powerful earthquake struck the northeastern coast of Japan at two forty-six p.m. local time on March eleventh. Japan’s media rheological agency released its first tsunami warnings just three minutes later. The country has one of the best earthquake early warning systems in the world. There are more than four thousand sense make intensity meters in place throughout Japan to measure earthquake activity. These meters provide information within two minutes of an earthquake happening. Information about the strains and the center of the earthquake can be learned within three minutes.
There are also concrete seawalls around much of the Japanese coast line. But these measures proved no match for the powerful earthquake and tsunami.
Caster S is a tsunami expert with the department of civil and environmental engineering at the University of Suben California in Los Angeles. “Japan is one of the most well prepared countries on earth in dossal in which tsunami warnings. They had a warning, but I think what was strong is, they had not a dissipated size of this usement.”
He says there are two reasons for this. Japan has not had any event anywhere near as big as this one in the last one hundred fifty years. And scientists had not expected such a large earthquake happening off the coast of Japan. The 9.0 magnitude earthquake was the fourth most powerful earthquake ever recorded worldwide. It was also the worst earthquake ever to heat Japan.
The tsunami waves that followed were reported to have reached as high as thirteen meters in some areas. Caster S says Japan’s concrete seawalls were not built to handle such high waves. “The concrete seawalls in many places in the Japan are about three meters such about thirty three feet. In the sand ai there were about three meters such about thirty three feet. So that soze used at misting that areas they were not expecting such size of waves.”
A tsunami wave can travel as fast as eight hundred kilometers per hour. To get to higher ground, people would often have to travel for many kilometers. This can take more time than a fast traveling tsunami will permit. This is especially true in cases like Japan where the center of the earthquake struck so close to the coast line. The tsunami waves followed almost immediately.
Experts say early warning systems will continue to be limited by these facts until earthquakes and tsunamis can be predicted.
And that’s the VOA SE technology report written by J. You can find more news about the disaster in Japan at our website VOASE.COM. You can also find transcripts, mp3s and pot gets of our reports. And you can find us on face book and utube at VOA learning English.
I’m Steve Ember.
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